% Author: Prof. Dr. Matthias Jung, DL9MJ
% Year: 2024
\begin{circuitikz}
    \draw(0,0) 
        to [R, o-, l={$R_1$}] ++(2,0) 
        to [R, l={$R_2$}] ++(2,0) 
        to [R, -o, l={$R_3$}] ++(2,0);
\end{circuitikz}